Abstract

A series of polyphenylquinoxaline (PPQ) ultrafine non-woven fibrous membranes have been first successfully prepared via the electrospinning procedure with the soluble PPQ solutions as the starting materials. For this purpose, various organo-soluble PPQ resins were synthesized via the one-step high temperature polycondensation procedure from the aromatic ether-bridged bis(α-diketone) and bis(o-diamine) monomers. Flexible ether linkages and pendant bulky phenyl substituents endowed the PPQ resins good solubility in polar aprotic solvents. The high-molecular-weight PPQ resins were dissolved in N-methyl-2-pyrrolidone (NMP) to afford the PPQ electrospinning solution except PPQ-I_a derived from 4,4′-oxydibenzil (ODB) and 3,3′-diaminobenzidine (DAB) due to the limited solubility in the solvent. All the derived PPQ ultrafine non-woven fibrous membranes maintained good structure integrity after hydrolysis aging either at room temperature (25 °C) for 72 h or at refluxing temperature (100 °C) for 24 h in an aqueous sodium hydroxide (NaOH) solution at a solid content of 20 wt%. Comparatively, the polyimide (PI) reference electrospun membrane (PI-ref) derived from 1,2,4,5-pyrromellitic anhydride (PMDA) and 4,4′-oxydianiline (ODA) lost its original structure only after boiling in the same NaOH solution within 3 h. In addition, the developed PPQ ultrafine non-woven fibrous membranes exhibited good thermal stability with the 5 % weight loss temperatures (T_5%) higher than 555.0 °C in nitrogen and glass transition temperatures (T_g) in the range of 248.1–266.1 °C, respectively.

中文翻译：

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具有优异的耐热性和耐碱性的电纺聚苯基喹喔啉超线非织造纤维膜：制备与表征

抽象的

首次通过电纺丝工艺成功制备了一系列以可溶性PPQ溶液为原料的聚苯基喹喔啉（PPQ）超细非织造纤维膜。为此，通过一步式高温缩聚步骤，由芳族醚桥联的双（α-二酮）和双（邻二胺）单体合成了各种有机可溶性PPQ树脂。灵活的醚键和侧基庞大的苯基取代基赋予PPQ树脂在极性非质子溶剂中的良好溶解性。高分子量PPQ树脂溶解在ñ -甲基-2-吡咯烷酮（NMP），得到除PPQ-I的PPQ静电溶液_一由于在溶剂中的溶解度有限，因此衍生自4,4'-氧二苯甲腈（ODB）和3,3'-二氨基联苯胺（DAB）。在室温（25°C）水解老化72 h或在氢氧化钠（NaOH）水溶液中回流温度（100°C）水解24 h后，所有衍生的PPQ超细非织造纤维膜均保持良好的结构完整性。固含量为20 wt％。相比较而言，由1,2,4,5-均苯四甲酸酐（PMDA）和4,4'-氧二苯胺（ODA）衍生的聚酰亚胺（PI）参考电纺膜（PI-ref）仅在相同温度下煮沸后才失去其原始结构。 NaOH溶液在3小时内。此外，已开发的PPQ超细非织造纤维膜在5％的失重温度（T _5％的温度）下表现出良好的热稳定性。）的氮和玻璃化转变温度（T _g）分别高于555.0°C和248.1–266.1°C。